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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Cash flows from operating activities:    
Net earnings $ 963 $ 1,260
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:    
Depreciation 621 628
Bad debt provision   26
Stock based compensation expense 47 58
Provision for deferred income tax expense (10) (15)
Change in assets and liabilities:    
Decrease (increase) in receivables 989 (2,262)
Increase in inventories (1,225) (275)
Increase in accounts payable and other accrued expenses 449 877
Increase in deferred revenue 386 146
Other, net (699) (638)
Net cash provided by (used in) operating activities 1,521 (195)
Cash flows from investing activities:    
Capital expenditures (472) (541)
Decrease (increase) in restricted cash 312 (1,968)
Net cash used in investing activities (160) (2,509)
Cash flows from financing activities:    
Dividends paid (316) (288)
Dividends paid to noncontrolling interest in subsidiaries (75)  
(Decrease) increase in short-term borrowings and interest rate swaps (54) 2,064
Payments on long-term debt (106) (105)
Payment toward purchase of noncontrolling interest in subsidiary (888) (888)
Net cash (used in) provided by financing activities (1,439) 783
Effect of exchange rate changes on cash (67) 41
Decrease in cash and cash equivalents (145) (1,880)
Cash and cash equivalents, beginning of period 3,044 6,248
Cash and cash equivalents, end of period $ 2,899 $ 4,368